Superheater-boiler.



J. E. BELL. SUPERHEATEB BOILER.

APPLICATION FILED MAY 31, 190 6.

Patented 06c. 28, 1913.

INVENTOR find/4 7m 4 WITNESSES UNITED s'rA'rns PATENT OFFICE.

, JOHN BELL, OF YORK, N. Y., ASSIGNOR TO THE BABCOCK & WILCOX COMPANY,

OF NEV YORK, N. -Y., A CORPORATION OF NEW JERSEY.

snrERHEArEnomnn.

Specification of Letters Patiiht. V

Application filed May 31, 1906. Serial No. 319,457.

To all whom it may concern:

Be a known that I, JOHN E. BELL, a.- citizen of the United States, residing in New ing drawing, forming part of this specifica-' tion, in which the figure is a sectional side elevation showing superheater-boller.

My invention relates to the applying of.

superheaters to water tube boilers havin a plurality of banks of vertically extending tubes in series, as regards the passage of the furnace gases; and its object is to combine a superheater, particularly one; of U-shape type, with such a boiler m such a way asto give economical results and good etlici'en'cy, while avoiding difiiculties heretofore. .incident to the use of superheaters in such'types of boilers. I

In the drawing, 2, 3 and 4 represent upper transverse steam and waterdrums connected by vertically'inclined tubes 5, 6 and 7 tothe' lower transverse mud drum 8. i

9 is the furnace, the flame and gases from which are directed among the tubes of the frontbank by the battle 10 extending along its rear and preferably having a shelf 11. The gases flow down from'the top of the" front bank over the second bank to the-bot-v tom of the bafile 12, whence they arise extend across the setting between the side walls and are exposed to the hot gases cir culating through the second ass. From them extend upwardly the Us aped superheater tube 16 the,bends of whiohare preferably-below the 'vvat'eik circulators' v18 extending between the water spaces of the steam and water drums 3 and 4 below the re fractory partition 17. .The superheater tubes are preferably inclined upwardly "andfforwardly in the general direction of .;;the water tubes and I have shown thefsteain as. led

one'form of my improved the front drum 2 also passing in the middle U-shaped tubes to the other box and is taken ofi through the outlet pipe 22. In this 10- and the boxes or headers are more or less and tothehot gases. A fairly high degree superheater tubes and the-boxes, is prevented by the fact' that the flame and gases strike theupper may beplaced in the second pass, since/the temperature'of the gases is reduced by the super-heater supports, avoiding special supporting devices which might be in ured by the high temperature. Expansion and contractionofthesuperheating tubes is taken up in the tubes and does not injure the expanded joints or force the headers out of place. As the" U-tubes extendin a general. vertical directionthere' are no excessive side strains on which .mightcause them to sag under 'the placing headers in the walls of the setting or outside is done-away with and the headers give additional 'superheating surface.

Thesuperheater is of low cost, is. simple in construction and may be easily reached rear of -the baflie, where used, may be varied ,in width to regulate the superheah;

high temperatures. The complication due to;

for inspection and repair. The shelf at the Patented. Oct. '28, 1913.

from the front drum 4. into the middle drum i 3 through pipes 20, any steam generated in 3 drum through tubes 19. The steam in this. a v form is taken from the middle drumthrough pipe21 to one of the boxes, preferably the 7 upper box 14, whence it. flows through the cationof the U-tube superheater, the tubes exposed-to the flaming action of the furnace of superheat may therefore be obtained while, at the samev time, the superheater is;

"readily accessible. Injury to the expanded;- joints, when these are used between the parts of the superheater tubes before-reaching the boxes. The boxes or". headers form a superheating surface While injury to the joints is avoided. The. inverted" U-tube superheater gives good. di'ainage for condensation; and interference with the water'circulating'tubes, where .these are used, is avoided. The super-heater,

water tubes and thesuperheating tubes suf- V i 'ficiently to prevent injur to the headers and .joints therein. The hea ers thus serve as the, I

the joints vbetween.them} and the headers,

The superheater does notinterfere with the standard type of boiler, nor require any -change in design.- It can also be readily applied to existing boilers.

A number of mud drums may be used, two or more banks of water tubes may be employed, and many other changes may be made without departing from my invention.

I claim: I

1. The combination with a water tube boiler having a plurality of banks of vertically extending tubes in series as regards the passage of the furnace gases, separated a by a baliie over which the gases flow in passing from the front bank to the next, of a superheater between said banks of tubes, comprising a plurality of headers behind said battle connected by superheating tubes extending upwardly from the headers.

2. The combination with a Water tube boiler having a plurality of banks of vertically extending tubes in series as regards the passage of the furnace gases, of a battle back of the front bank of tubes, and an inverted U-tube superheater in the rear of said battle and between the first and second bank of tubes.

3. The combination with a water tube boiler having a plurality of banks of vertically extending tubes in series as regards the passage of the furnacegases, 'of'a super heater between the first and second banks of tubes said'superheater comprising headers 0r oxes extending between the side walls of the setting and connected by superheating tubes extending upwardly therefrom.

4. The combination'with a water tube boiler having a plurality "of banks of ver,

tically extending tubes in series as regards thepassage of the furnace gases and having at least two steam and water drums with water circulators between them, of a supcrhmter back of the baflie for the front bank and comprising a ,plurality OfECl19d11- hers between the side walls and connected by superheating tubes extending upwardly therefrom. v V v r 5. The combination with a water tube boiler of the general Stirling type having a triangular space between the first and second banks, of an inverted U-tube superheater located in the upper portion of said triangular space, and having headers extending across from side wall to side wall and exposed to the products of combustion.

6. The combination with a water tube boiler havin aplurality of banks of vertically exten ing tubes. in series as regards a the passage of the furnace gases, separated by a bafiie over which the gases flow in pass ing from the front bank to the next, said baiiie having arearwardly projecting shelf, of a superheater between said banks of tubes comprising a plurality of headers behind co prising a plurality of chambers behind sai bafiie, said headers vbeing connected by supprheating tubes which extend upwardly from the headers "and are inclined forwardly in the general directionof the water tubts. I

In testimony whereof,,I have hereunto set my hand.

JOHN E. BELL.

Witnesses:

CHARLES B. KNUDsoN, Gnonon H. SoNnnBoRN." 

